Add WaitConditions

Signed-off-by: Angus Salkeld <asalkeld@redhat.com>

heat/engine/parser.py

@@ -90,6 +90,11 @@ class Stack(object):
             elif type == 'AWS::EC2::SecurityGroup':
                 self.resources[r] = security_group.SecurityGroup(r,
                                                 self.t['Resources'][r], self)
+            elif type == 'AWS::CloudFormation::WaitConditionHandle':
+                self.resources[r] = wait_condition.WaitConditionHandle(r,
+                                                self.t['Resources'][r], self)
+            elif type == 'AWS::CloudFormation::WaitCondition':
+                self.resources[r] = wait_condition.WaitCondition(r,
                                                 self.t['Resources'][r], self)
             else:
                 self.resources[r] = resources.GenericResource(r,

heat/engine/wait_condition.py

@@ -0,0 +1,118 @@
+# vim: tabstop=4 shiftwidth=4 softtabstop=4
+
+#
+#    Licensed under the Apache License, Version 2.0 (the "License"); you may
+#    not use this file except in compliance with the License. You may obtain
+#    a copy of the License at
+#
+#         http://www.apache.org/licenses/LICENSE-2.0
+#
+#    Unless required by applicable law or agreed to in writing, software
+#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+#    License for the specific language governing permissions and limitations
+#    under the License.
+
+import eventlet
+import logging
+import os
+
+from heat.common import exception
+from heat.engine.resources import Resource
+
+logger = logging.getLogger(__file__)
+
+class WaitConditionHandle(Resource):
+    '''
+    the main point of this class is to :
+    have no dependancies (so the instance can reference it)
+    generate a unique url (to be returned in the refernce)
+    then the cfn-signal will use this url to post to and
+    WaitCondition will poll it to see if has been written to.
+    '''
+
+    def __init__(self, name, json_snippet, stack):
+        super(WaitConditionHandle, self).__init__(name, json_snippet, stack)
+        self.instance_id = ''
+
+    def create(self):
+        if self.state != None:
+            return
+        self.state_set(self.CREATE_IN_PROGRESS)
+        Resource.create(self)
+
+        # generate a unique url
+        self.instance_id = '%s?%s&%s' % (self.stack.metadata_server,
+                                         self.stack.name,
+                                         self.name)
+
+        self.state_set(self.CREATE_COMPLETE)
+
+    def delete(self):
+        if self.state == self.DELETE_IN_PROGRESS or \
+           self.state == self.DELETE_COMPLETE:
+            return
+
+        self.state_set(self.DELETE_IN_PROGRESS)
+        Resource.delete(self)
+        self.state_set(self.DELETE_COMPLETE)
+
+    def FnGetRefId(self):
+        '''
+        Wait Condition Signal URL
+        example: https://cloudformation-waitcondition-us-east-1.s3.amazonaws.com/arn%3Aaws%3Acloudformation%3Aus-east-1%3A803981987763%3Astack%2Fwaittest%2F054a33d0-bdee-11e0-8816-5081c490a786%2FmyWaitHandle?Expires=1312475488&AWSAccessKeyId=AKIAIOSFODNN7EXAMPLE&Signature=tUsrW3WvWVT46K69zMmgbEkwVGo%3D
+        so we need:
+        - stackname
+        - region
+        - self.name (WaitCondition name)
+        - Expires
+        - AWSAccessKeyId
+        - Signature
+
+        '''
+        return unicode(self.instance_id)
+
+class WaitCondition(Resource):
+
+    def __init__(self, name, json_snippet, stack):
+        super(WaitCondition, self).__init__(name, json_snippet, stack)
+        self.instance_id = ''
+
+        self.handle_url = self.t['Properties']['Handle']
+        self.timeout = self.t['Properties']['Timeout']
+
+
+    def create(self):
+        if self.state != None:
+            return
+        self.state_set(self.CREATE_IN_PROGRESS)
+        Resource.create(self)
+
+        eventlet.sleep(int(self.timeout) / 2)
+#        timeout = Timeout(seconds, exception)
+#        try:
+            # keep polling the url of the Handle and get the success/failure
+            # state of it
+            # execution here is limited by timeout
+#        except Timeout, t:
+#            if t is not timeout:
+#                raise # not my timeout
+#            else:
+#                self.state_set(self.CREATE_FAILED,
+#                               '%s Timed out waiting for instance to start' % self.name)
+#        finally:
+#            timeout.cancel()
+
+        self.state_set(self.CREATE_COMPLETE)
+
+    def delete(self):
+        if self.state == self.DELETE_IN_PROGRESS or \
+           self.state == self.DELETE_COMPLETE:
+            return
+
+        self.state_set(self.DELETE_IN_PROGRESS)
+        Resource.delete(self)
+        self.state_set(self.DELETE_COMPLETE)
+
+    def FnGetRefId(self):
+        return unicode(self.name)